Let's say your guy gives you a box with a new leather bag and wallet inside for Christmas. You both set a budget of $150 for Christmas presents, so you'd assume he picked the cheaper bag so he could add in the wallet. What if he only gave you the leather bag, though? You'd probably assume he spent the entire $150 on the bag, even if he really didn't.

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So, don't worry about getting him a bunch of "perfect" presents this holiday. Instead, focus on one thing on his wish list and go out all (as much as your budget will allow). He'll appreciate it more—and you'll look like the great girlfriend who spent a bunch of time and money finding the perfect present.

If you do get him more than one gift, just make sure to wrap it separately. Researchers found that another gift in a separate package was totally fine.

Tell us: Do you go for one present, or lavish your loved ones with tons of gifts?